400 Geological Society. 



the terms Upper and Lower Miocene were used merely as marking 

 what seems to be their relative antiquity. Out of sixty-one species 

 enumerated in this communication, thirty-four have been found to 

 be common to Jamaica and San Domingo, and fourteen to Jamaica 

 and Cumana. Thirteen species are ascertained to be still living, 

 some of which have been found in the Miocene of Europe and other 

 localities. Several of the extinct species exhibit strong eastern 

 affinities ; but there is also a resemblance between a part of the 

 fauna and that now existing in the West Indies; and a certain 

 number of the species are allied to European early and middle 

 Tertiary forms. The fauna as a whole is more nearly related to 

 that of Bordeaux, Dax, and Malta than to that of the American 

 Miocene deposits. 



2. " On Tertiary Echinoderms from the West Indies." By 

 R. J. Lechmere Guppy, Esq. 



The Corals, Shells, and Foraminifera of the West-Indian Miocene 

 having been more or less completely described, the author now 

 brought under notice the Echinoderms belonging to the same fauna, 

 which have been found in Anguilla and Trinidad associated with 

 shells determined to be of Miocene age. The species sufficiently 

 well preserved for determination are nine in number, of which two are 

 found in the Maltese beds ; three others, which are new, are closely 

 allied to species found in the same locality. Three out of the nine 

 are still living in the West-Indian seas, but these are rare in the 

 fossil state. 



3. " On Tertiary Brachiopoda from Trinidad." By ft. J. Lech- 

 mere Guppy, Esq. 



The beds whence these Brachiopoda were derived have already 

 been mentioned in the previous papers ; their organic remains 

 have led to the belief that they belong to a lower horizon in the 

 Miocene series than the beds of Jamaica, Cumana, and San Domingo. 

 The Brachiopoda, which consist of three species of Terebratula, can 

 hardly be considered to throw much new light upon the question, 

 as they seem to be suggestive of Cretaceous affinities. As it bad 

 been suggested that the fossils in question might be derived from 

 older beds, the reasons which have led the author to an opposite 

 opinion were stated ; and it was remarked, in conclusion, that they 

 do not resemble those of Malta. 



4. " On the affinities of Platysomus and allied genera." By John 

 Young, M.D., F.G.S. 



The author described in detail the anatomy of Platysomus par- 

 vulus, Ag., and two new genera, Amphicentrum and Mesclepis, all 

 from the North Staffordshire Coal-field, and, after discussing their 

 relations to other ganoids and to the Teleostei, proposed their in- 

 clusion, with the Pycnodonts and Eurynotus, in a distinct suborder 

 of Ganoids. 



Suborders I. Amiadce, II. Lepidosteidce, III. Crossopterygidce, 

 IV. Chondrosteidce, V. Acanthodidce, have already been described 



